23&Me will let you download a text file with the ACGT data, but only for the SNPs that it has. 23&Me does not sequence your full genome, so the SNPs available are a small subset of your DNA.
Prometheus is not open-source (I think), but all it does is read various files with DNA data (like the 23&me export), and match it up with the information in SNPedia (a Wikipedia-like open repository of what we know about certain SNPs), and then exports it to a pretty HTML/JS web report for you that you can download and save.
Prometheus is not open-source (I think), but all it does is read various files with DNA data (like the 23&me export), and match it up with the information in SNPedia (a Wikipedia-like open repository of what we know about certain SNPs), and then exports it to a pretty HTML/JS web report for you that you can download and save.